An Analytical Reentry Guidance Method Considering the Constraints of Multiple No-fly Zones

Abstract

The invention discloses an analysis reentry guidance method considering the restraint of multiple no-fly zones. To overcome the influences from earth rotation, conventional aerodynamic force and inertia force caused by earth rotation are combined into equivalent aerodynamic force. Then, the longitudinal range analytical solution is utilized for planning the equivalent longitudinal lift-drag ratioprofile, and accordingly, the longitudinal range and energy management requirements are met; the transverse range analytical solution is utilized for planning the equivalent transverse lift-drag ratioprofile meeting the no-fly zone restraint and transverse range requirements. An inverted point gradual increasing type analysis iteration planning strategy is designed and comprises a plurality of analysis methods which are used for solving the flight track point, closest to the no-fly zones, on the track, adjusting existing inverted points for avoiding the no-fly zones, increasing the inverted points to avoid the no-fly zones and planning the inverted points to eliminate the terminal course error. Iteration starts from two times of inversion, and then the number of inversion times is gradually increased according to the no-fly zone avoiding requirement. In addition, since the planning strategy is completely based on the analytical solutions, the planning strategy is extremely high in planning efficiency and can be executed online.

Description

technical field [0001] The invention relates to an analytical reentry guidance method considering the constraints of multiple no-fly zones, and belongs to the fields of aerospace technology and weapon technology. Background technique [0002] Hypersonic gliding vehicles are generally sent to a predetermined altitude by booster rockets, and then re-enter the atmosphere from orbit or suborbit without power. In order to obtain long-range flight capability and strong lateral maneuverability, aircraft usually adopt a lift body structure with a large lift-to-drag ratio. However, aircraft sometimes need to avoid some politically sensitive areas and military threat areas. This poses a serious challenge to the design of the reentry guidance law for two reasons. First, due to the unpowered gliding, the reentry guidance law needs to carefully manage the energy of the aircraft in the harsh mechanical and thermal environment and guide the aircraft to fly to target, which prevents the a...

AI Technical Summary

Problems solved by technology

This brings difficulties and challenges to the design of gliding vehicle reentry guidance

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